Which of the following best describes energy in the form of heat?
a measure of the average kinetic energy of the particles in a sample of matter
the energy transferred between samples because of a difference in their temperatures
bond energy
the energy stored in a sample of matter
10. Multiple Choice
30 seconds
1 pt
How much energy is needed to raise the temperature of 58.6 g of argon from 23.4oC to 55.6oC? The specific heat capacity of argon 0.520 J/g⋅K.
981 J
1671 J
1887 J
3.50 J
11. Multiple Choice
30 seconds
1 pt
A process that releases heat is a(n)
ectothermic process
exothermic process
endothermic process
polythermic process
12. Multiple Choice
30 seconds
1 pt
The greater the average kinetic energy of the particles in a sample of matter
the more energy is absorbed by the sample in the form of heat.
the less energy is released by the smaple in the form of heat.
the lower the temperature is.
the higher the temperature is.
13. Multiple Choice
30 seconds
1 pt
What is the energy required to raise the temperature of 1 g of a substance by 1oC or 1 K?
specific heat
heat energy
enthalpy of formation
heat capacity
14. Multiple Choice
30 seconds
1 pt
When 41.5 g of an alloy, at 24.6oC, are dropped into 100.0 g of water, the alloy absorbs 954 J of heat. If the final temperature of the allow is 39.2oC, what is its specific heat?
1010 J/g⋅K
0.595 J/g⋅K
336 J/g⋅K
1.57 J/g⋅K
15. Multiple Choice
30 seconds
1 pt
On what principle does calorimetry depend?
law of conservation of energy
law of enthalpy
Hess's Law
law of multiple proportions
16. Multiple Choice
30 seconds
1 pt
In a calorimeter, the energy content of a substance is calculated from measurement of the temperature change in a known mass of
steel
air
iron
water
17. Multiple Choice
30 seconds
1 pt
The specific heat of mercury is 0.140 J/g⋅K. How many joules of energy are needed to warm 4.52 g of mercury from 24.6 oC to 27.1 oC?
0.632 J
13.8 J
3.96 J
1.58 J
18. Multiple Choice
30 seconds
1 pt
Energy is measured in units of
kelvin
grams
pounds
joules
19. Multiple Choice
30 seconds
1 pt
To determine the amount of energy as heat associated with the change taking place in a calorimeter, the information that is not needed is the
specific heat of the calorimeter
specific heat of the water
change in temperature of the water
air temperature outside the calorimeter.
20. Multiple Choice
30 seconds
1 pt
The energy transferred between samples of matter because of a difference in their temperatures is called
temperature
thermochemistry
heat
chemical kinetics
21. Multiple Choice
30 seconds
1 pt
The quantity of energy transferred as heat during a temperature change between two species depends on the
mass of the two materials involved in the temperature change.
nature of the two materials involved in the temperature change.
magnitude of the temperature change.
All of the above.
22. Multiple Choice
30 seconds
1 pt
What units are used to measure specific heat?
cal/g⋅K
J/g⋅oC
J/g⋅K
all of these
23. Multiple Choice
30 seconds
1 pt
How much energy is absorbed as heat by 18.7 g gold when it is heated from 28.2oC to 31.8oC? The specific heat of gold is 0.13 J/g⋅K.
0.675 J/g⋅K
8.8 J
8.8 J/g⋅K
0.675 J
24. Multiple Choice
30 seconds
1 pt
How much energy does a copper sample absorb as energy in the form of heat if its specific heat is 0.384 J/g⋅K, its mass is 8.53 g, and it is heated from 11.3 oC to 44.7 oC?
135 J/g⋅K
285 J
109.4 J/g⋅K
109.4 J
25. Multiple Choice
30 seconds
1 pt
How is a Celsius temperature converted to a Kelvin temperature reading?
by dividing by 273.15.
by subtracting 273.15
by adding 273.15
by multiplying by 273.15
26. Multiple Choice
30 seconds
1 pt
The Greek letter Δ stands for
"heat stored in"
"rate of"
"change in"
"mass of"
27. Multiple Choice
30 seconds
1 pt
What is the mass of a sample that absorbs 50.2 J of energy when it is heated from 274 K to 360 K and has a specific heat of 0.292 J/g⋅K?
2.00 g
14785 g
-0.297 g
2.00 kg
28. Multiple Choice
30 seconds
1 pt
ΔH =
Hproducts × Hreactants
Hreactants − Hproducts
Hproducts − Hreactants
Hproducts + Hreactants
29. Multiple Choice
30 seconds
1 pt
The q in thermodynamic equations is
temperature
mass
specific heat
energy lost or gained
30. Multiple Choice
30 seconds
1 pt
A 4.5 g sample of metal was heated from 8.4 oC to 22.4 oC. It absorbed 41.9 J of energy as heat. What is the specific heat of this material?
0.453 J/g⋅K
130 J/g⋅K
1.50 J/g⋅K
0.665 J/g⋅K
31. Multiple Choice
30 seconds
1 pt
When your body breaks down sugar completely, how much heat is released compared to burning the same amount of sugar in a flame?
The body released more heat.
The body releases no heat.
The body releases less heat.
The body releases the same amount of heat.
32. Multiple Choice
30 seconds
1 pt
A chemical reaction is exothermic when ΔH is
constant
positive
zero
negative
33. Multiple Choice
15 minutes
1 pt
Find the specific heat of a material is a 9.98 g sample absorbs 55.4 J when it is heated from 33.9 oC to 53.1 oC.
107 J
-0.289 J/g⋅K
0.289 J/g⋅K
28.8 J
34. Multiple Choice
30 seconds
1 pt
The term thermodynamics refers to the study of
only chemical changes.
energy changes.
only physical changes.
none of these.
35. Multiple Choice
30 seconds
1 pt
A 7.97 g sample of silver is heated from -6.9 oC to 31.7 oC and absorbs 73.9 J of energy as heat. What is the specific heat of silver?